Library Open Repository

HPG axis activity in juvenile blotched blue-tongued skinks, Tiliqua nigrolutea

Downloads

Downloads per month over past year

Edwards, A and Jones, SM (2006) HPG axis activity in juvenile blotched blue-tongued skinks, Tiliqua nigrolutea. ANZSCPB 2006. (Unpublished)

[img]
Preview
PDF
Edwards_and_Jones.pdf | Download (11kB)
Available under University of Tasmania Standard License.

Abstract

We are investigating seasonal sex- and age-related differences in the activity of the hypothalamic-pituitary-gonadal axis in the blotched blue-tongued lizard, Tiliqua nigrolutea as part of an overall study of the onset of sexual maturation and its subsequent annual regulation in a seasonally-breeding, viviparous reptile. Males of this species breed annually, while females exhibit a multiennial cycle; age at maturity is unknown. Juveniles at ages 1, 6, 12, 18, 24 and 30 months of age were injected with GnRH and we measured the resulting plasma sex steroid (testosterone (T) and oestradiol (E2)) concentrations, to examine the age of onset of HPG axis regulation: we plan to follow these juveniles over time until sexual maturity is reached. We found clear sex- and age-related differences in the production of T and E2 (as a measure of the activity of the HPG axis) from a relatively early age. We have used a number of techniques to confirm sex in these juveniles, and have correlated this with changes in T:E2 at ages 24 and 30 months. This longitudinal study of juveniles of (now) known sexes has allowed us to examine characteristics such as head width and body size (growth) for the onset of the sexual dimorphisms observed in adults. We have correlated these to endocrine profiles and other aspects of life history.

Item Type: Other
Publisher: ANZSCPB 2006
Additional Information: Conference abstract Australia and New Zealand Society for Comparative Physiologists and Biochemists, Brisbane 2006
Date Deposited: 19 Jan 2007
Last Modified: 18 Nov 2014 03:12
URI: http://eprints.utas.edu.au/id/eprint/647
Item Statistics: View statistics for this item

Repository Staff Only (login required)

Item Control Page Item Control Page